JPH02238189A - Scroll compressor - Google Patents

Abstract

PURPOSE: To maintain compliance with respect to a stationary scroll by defining a pressurizing chamber between an elongated groove formed in a peripheral wall of a crank chamber at a surface opposing an orbiting scroll, and a seal means so that the orbiting scroll is pressed by the pressure of pressurized fluid in the pressurizing chamber. CONSTITUTION: A scroll compressor 10 has a stationary scroll 20 defining a high pressure chamber 13 in a wall member 12, and a crank chamber 40 is fixed to the stationary scroll 20 by means of bolts or the like. An orbiting scroll 30 cooperating with the stationary scroll 20 so as to compress fluid is accommodated in a space between the stationary scroll 20 and the crank chamber 40. This orbiting scroll 30 orbits through the rotation of a crankshaft 60. In this arrangement, curved elongated grooves 42, 43 formed in the crank chamber 40, are blocked by seals 66, 68 so as to define pressurizing chambers 50, 52. High pressure exhaust gas in the high pressure chamber 13 is introduced into these pressurizing chambers 50, 52 through a passage means, and accordingly, the orbiting scroll 30 is pressed toward the stationary scroll 20.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to the structure of an airtight scroll compressor.

[Prior Art] During the compression process of a scroll compressor, the pressure of the compressed gas acts on the scroll member and tends to disintegrate the member in the radial and axial directions. In order to establish axial sealing and axial compliance between the scroll members, a pressurized chamber sealed with a seal and filled with high pressure gas is provided between the rear of the orbiting scroll and the crank chamber. This pressurized chamber does not interact with either the Oldham joint, the orbiting scroll groove, the crankcase groove, or the internal bore. Furthermore, this high-pressure gas-filled pressurized chamber is sealed using two O-shaped annular long grooves compressed behind the orbiting scroll.

[Problems to be Solved by the Invention] However, the main drawback of this structure is that the size of the sealed pressurized chamber filled with high-pressure gas is limited. One way to increase this area is to increase the diameter of the Oldham joint, which results in an enlargement of the crank chamber and thus the diameter of the compressor wall.

Generally, the diameter of the compressor wall is defined by the motor frame to obtain the required power, so it is undesirable for this to be enlarged.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a scroll compressor in which compliance with a fixed scroll is established using the orbiting scroll itself without increasing bearing loads or the envelope of the orbiting scroll.

Another object of the present invention is to provide a scroll compressor whose overturning moment is minimized.

Another object of the present invention is to provide a scroll compressor that reduces frictional force by reducing load.

[Means for Solving the Problems] In order to achieve the above object, there is provided a scroll according to the present invention, which has a fixed scroll, an orbiting scroll that revolves on an Oldham joint ring, and a crank chamber, and is in an airtight state. In the compressor, a long groove is formed in a surface of the peripheral wall of the crank chamber facing the orbiting scroll, and a sealing means is formed inside the long groove to form a seal in close contact with the surface facing the orbiting scroll, and the long groove and the sealing means are connected to each other. a pressurized chamber is formed, a pressurized fluid introducing means is formed in the crank chamber so as to be filled into the pressurized chamber, and the orbiting scroll is driven by the pressurized fluid introduced into the pressurized chamber. Pressing toward the fixed scroll to maintain compliance between the orbiting scroll and the fixed scroll. Here, the pressurizing chamber is constituted by two symmetrical elongated holes, and the elongated holes, the elongated groove, and the sealing means are arranged inside the Oldham ring along the shaft hole of the crankshaft. They have an elongated curved hole structure and are arranged in symmetrical positions inside the crank chamber.

Also, the structure is such that the orbiting scroll is lifted out of the crank chamber and placed on the seal.

Furthermore, the long grooves of the Oldham joint are arranged close to each other in the center to reduce the envelope of the compressor.

[Function] In the scroll compressor configured as described above, the compressed gas introduced via the introduction path into the pressurized chamber for filling high-pressure compressed gas, which has the maximum effective area, lifts the orbiting scroll. It works by placing it on top of the seal created around the pressurized chamber.

In addition, this seal and the orbiting scroll interact,
Maintain axial compliance between the fixed scroll, the orbiting scroll, and the crank chamber.

[Example] One or more pressurizing chambers having the maximum area are arranged inside a scroll compressor. A suitable pressurized chamber for this purpose would be one that surrounds the bearing and the boss of the orbiting scroll and takes a generally figure-eight shape due to its interaction with the rotor dam joint ring and slot. Obviously, the area available for the pressurization chamber does not have a simple shape due to the construction of the scroll compressor. If we consider the figure 8-shaped waist as the axis of symmetry, the area that can be used as a pressurization chamber is:
In general, (1) a pair of curved elongated holes, (2) a pair of crescent-shaped elongated holes separated by two symmetrical circles, and (3) a figure-8 shape formed by connecting the outer circumferences of the pair of symmetrical circles; Three shapes are possible: this and one annular long hole formed between the circular cut in the center.

Hereinafter, the features of the present invention described above will be specifically explained in detail in preferred embodiments with reference to the accompanying drawings.

A typical low side scroll compressor 10 is shown in FIGS. 1 and 2. FIG. A muffler separation plate I4 is installed on top of the fixed scroll 20, thereby defining a high pressure chamber 13 within the wall member 12. The crank chamber 40 extends over the crankshaft 60 and is fixed to the fixed scroll 20 by bolting or other suitable means. Like a conventional scroll compressor, the orbiting scroll 30 has a wrap 2l of the fixed scroll 20 such that, during operation, one side of the plate portion 32 joins the fixed scroll 20 and the other side interacts with the Oldham coupling ring 64. Wrap 3 that fits with
It has l. In addition, the other surface of the plate portion 32 has seals 66 and 68 installed in curved long grooves 42 and 43 surrounding the pressure chambers 50 and 52, respectively, as shown in FIG. They are mated. The pressurized chambers 50 and 52 are filled with high-pressure exhaust from the high-pressure chamber l3, and this high-pressure exhaust flows through an inlet as shown in FIGS. 1, 3 and 6, ie an inlet opening into the muffler separation plate l4. Road 14-1, boring in fixed scroll 20-1
and 20-2, borings 40-1 and 40-2 in the crank chamber 40, and 40-3 and 40-4 that branch from these and open into the pressurizing chambers 50 and 52, and into the pressurizing chamber. be introduced.

Now, when the above-mentioned scroll compressor lO is in operation, gas compressed at high pressure is passed from the exhaust port 16 through the muffler separation plate l4 to the compressor exhaust line (
The high pressure gas is introduced into the high pressure chamber/(13) connected to the chamber l3 (not shown).
4-1 and boring 20-1, 20-2, 40-1, 40
-4 in order, and is introduced into pressurizing chambers 50 and 52.

Now, by filling the pressurizing chambers 50 and 52 with high pressure gas, this high pressure gas acts on the plate portion 32 of the orbiting scroll 30, and the orbiting scroll 30 moves into the crank chamber 4.
0 and serves to place it on seals 66 and 68 as shown in FIG. Here, the small net force acting on the orbiting scroll 30 joins the fixed scroll 20 and the orbiting scroll 30 in the axial direction, and the frictional force counteracts the separation force generated by the compressed gas acting on the fixed and orbiting scrolls. greatly reduced.

In manufacturing the embodiment shown in FIGS. 1-3, two curved slots 42 and 43 or other suitable slots are machined into crankcase 40. Seals 66 and 68 of annular or other suitable shape are then inserted into the grooves 42 and 4.
Place within 3.

Now, as shown in FIG. 4, annular long grooves 142 and 143 in the shape of connecting two rings are formed in the crank chamber 140 by mechanical forming or other suitable means, and as a result two crescent-shaped pressure chambers are formed. A second embodiment of the invention is shown in which 150 and 152 are formed. In this embodiment, a seal 166 is formed around the outer periphery of the grooves 142 and 143 in the shape of two connected rings. Here, all of the extreme positions of Oldham coupling ring 166 are shown to illustrate the areas in which pressurized chambers 150 and 152 can be formed.

As in the first embodiment shown in FIGS. 1 to 3, high pressure gas is introduced into elongated holes 150 and 152 via borings 140-3 and 140-4, respectively.

FIG. 5 shows a third embodiment of the invention. Similarly to FIG. 4, long grooves 242 and 24 have a shape in which two rings are connected.
3 is arranged, and furthermore, a third annular long groove 244 is arranged.
is formed around the opening 241 in the crank chamber 240. Seal 266 connects long grooves 242 and 243
A seal 268 is formed at the outermost periphery of the groove 244 . As a result, seals 266 and 26
One annular pressurized chamber 250 separated by 8 is formed. Except that there is only one pressurized chamber, so high-pressure gas is introduced via boring 240-3.
Otherwise, it functions in the same way as in FIGS. 1 to 4. Boring 240-3 may also have a vertical rather than sloping entryway to simplify mechanical forming.

[Effects of the Invention] According to the present invention, by maximizing the effective area of the pressurizing chamber for filling high-pressure compressed gas, the orbiting scroll can be driven by the compressed gas directly introduced into the pressurizing chamber via the introduction path. It can be lifted and placed on top of the seal created around the pressurized chamber, and the seal and the orbiting scroll interact to maintain axial compliance between the fixed scroll, the orbiting scroll, and the crank chamber. can. Moreover, this makes it possible to reduce the load applied to these above-mentioned members, which in turn leads to a reduction in frictional force.

Further, since the pressurizing chamber is formed into a curved shape or a crescent shape, it is possible to obtain the maximum effective pressurizing chamber area without increasing the diameter of the envelope of the compressor.

That is, in the present invention, one or more pressurized chambers for filling high-pressure fluid are arranged on the contact surface of the crank chamber that contacts the rear of the orbiting scroll, and the pressurized chambers are arranged so as to have a maximum effective area. By forming the scroll compressor into a similar shape, axial compliance of the scroll compressor can be achieved without increasing bearing loads or increasing the outer diameter of the orbiting scroll.

The application of the present invention is not limited to the illustrated embodiments, but may be implemented in all modifications without departing from the gist of the present invention as stated in the claims. .

[Brief explanation of drawings]

In the accompanying drawings, FIG. 1 is a longitudinal cross-sectional view of a portion of the scroll compressor of the present invention, taken along line 1-1 shown in FIG. 3, in an inoperative state. FIG. 2 is a longitudinal cross-sectional view of a portion of the scroll compressor of the present invention, taken along line 2--2 in FIG. 3, with the axial compliance maintenance mechanism in operation. FIG. 3 is a horizontal sectional view of a portion of the scroll compressor shown in FIG. 1, taken along line 3--3. FIG. 4 is a horizontal sectional view similar to FIG. 3 of a second embodiment of the present invention. FIG. 5 is a horizontal sectional view similar to FIG. 3 of a third embodiment of the present invention. FIG. 6 is a partial cross-sectional view of FIG. 3 taken along line 6-6. O...Scroll compressor 2...Wall member 3...High pressure chamber 4...Muffler separation plate 4-1...Compressed gas introduction path 6...Exhaust port 0...Fixed scroll 0-1 , 20-2... Boring 1, 3l... Wrap 0... Orbiting scroll 2... Plate portion 0... Crank chamber 0-1, 40-4... Boring 2, 43... ...Curved long grooves 0, 52...High pressure gas filled pressurized chamber 0...Crankshaft 4...Oldham joint rings 6, 68...Seals 42, 143...Annular long grooves 50, 152... Crescent-shaped pressurizing chamber 164... Oldham joint ring 166... Seals 140-3, 140-4... Boring 240... Crank chamber 241... Openings 242, 243, 244... Annular Long groove 250...Annular pressure chamber 266, 268...Seal 240-3...Boring FJG. 2 [NO in 0 ~ MAFIG. 3 FIG.

Claims (4)

[Claims] (1) An airtight scroll compressor having a fixed scroll, an orbiting scroll orbiting on an Oldham joint ring, a crank chamber, and a crankshaft, the long groove being formed on a surface of the peripheral wall of the crank chamber facing the orbiting scroll. and a pressurized chamber is formed by a sealing means that forms a seal in close contact with an opposing surface of the orbiting scroll, and the pressurized fluid introduced into the pressurizing chamber presses the orbiting scroll toward the fixed scroll. A scroll compressor characterized in that compliance of the orbiting scroll and the fixed scroll is maintained. (2) The pressurizing chamber is composed of two elongated holes, and the pressurizing chamber, the elongated groove, and the sealing means extend inside the Oldham joint ring along the shaft hole of the crankshaft. , characterized in that it has a curved long hole structure, and the long hole is arranged symmetrically with respect to the crank chamber.
Scroll compressor according to claim 1. (3) A scroll compressor having a fixed scroll, an orbiting scroll rotating on an Oldham coupling ring, and a crank chamber, which is kept in an airtight state, in which a pressurizing chamber is formed inside the flat plate surface of the crank chamber, and the pressurizing chamber is forming a long groove around the pressure chamber; forming a pressurized fluid introducing means inside the crank chamber so as to fill the pressurizing chamber; and disposing a sealing means inside the long groove; A method for manufacturing a scroll compressor, characterized in that a chamber is filled with pressurized fluid and the sealing means presses the orbiting scroll against the fixed scroll to maintain compliance between the orbiting scroll and the fixed scroll. 4. The method according to claim 3, wherein the pressurizing chamber is formed by arranging two curved symmetrical elongated holes inside the crank chamber.